Circuit arrangement for performance check of mobile broadcast reception systems

The invention relates to a mobile radio receiving system (20), comprising at least one receiving antenna (5) which is high frequency connected to a heterodyne receiver (1) provided with image rejection (4) and with a measuring device for detecting the reception level (10) , In the receiving system (20), a circuit arrangement (2) with a frequency converter (3) is present, in which during the functional test, both the oscillator signal (8) of the superposition receiver (1) and an IF carrier oscillation (32) is present whose frequency the center frequency of the IF signal (11) of the heterodyne receiver comes as close as possible and at the output of the frequency converter (3) an RF output signal (12) is formed,